Chimney-cowl.



No. 670,682. Patented Mar. 26, I901. E. MILLS, In, &. H. D. REESE.

CHIMNEY COWL.

Application filed July 21, 1900.)

' (lip Modal.)

74 1 fwwsses m: norms PETERS co. PHOTOLITNQ, WASNWGTON o. r

UNITED STATES PATENT OFFICE. y

EZEKIEL MILLS, JR., AND HENRY O. REESE, OF BALTIMORE, MARYLAND.

CHlMNEY-COWL.

SPECIFICATION forming part of Letters Patent No. 670,682, dated March 26, 1901.

Application filed July 21, 1900. Serial No. 24,357- (No model.)

To (0Z7 whom it may concern:

Be it known that we, EZEKIEL MILLS, J r., and HENRY O. REESE, of the city of Baltimore, in the State of Maryland, have invented certain Improvements in Ohimney-Cowls, of which the following is a specification.

The object of this invention in common with others of its class is to increase the draft in a chimney; and the invention, briefly stated, consists in providing the main central smoke-pipe of the cowl with a downwardly-extending flared flange and a system of inclined pipes leading from openings in the wall of the main smoke-pipe which extend and converge above the top of the main smoke-pipe. The main central smoke-pipe, with its attachments, as described, is covered by a hood having a central exit-aperture protected against the entrance of rain by a cap, as will hereinafter fully appear.

In the further description of the said invention which follows reference is made to the accompanying drawings, forming a part hereof, and in which Figure 1 is an exterior side view of the improved chimney-cowl. Fig. 2 is a half-vertical section of Fig. 1 looking in the direction indicated by the arrow to the left of that figure. Fig. 3 is a section of Fig. 1 taken on the dotted line a 0:.

Referring now to the drawings, A is the main central smoke-pipe of the cowl, which is erected on the top of the chimney (not shown) in the usual manner.

B is a downwardly-extending and flared flange attached in any suitable manner to the upper edge of the main central smokepipe A.

O is a conoidal hood having a central escape-nozzle a, supported at a suitable distance above the main central smoke-pipe A by means of the standards I).

D is a conical cap supported over the nozzle a, by means of the uprights c. This cap,

while allowing free exit of smoke from the hood, prevents the entrance of rain to the nozzle.

E E are openings in the wall of the main smoke-pipe A. We have shown the pipe as provided with three of these openings; but we do not confine ourselves to this number,

as the number will be governed by the size of the main smoke-pipe. From each of these openings E extends an inclined pipe F, and the pipes F converge toward the top, where they nearly or quite enter the hood 0.

Wind blowing from any direction upon striking the exterior of the wall of the main smoke-pipe A passes into the space formed by the downwardly-flared flange B, and in consequence of its motion being checked the pressure within the said space is somewhat increased. The wind checked in its motion, as described, naturally finds the readiest means of escape, which is by way of the inclined pipes F to the interior of the hood C and thence through the nozzle a to the outer air. The upward and converging currents of air produced by the inclined pipes F, as described, effect an upward movement of smoke in the main pipe A, and a reduction in pressure in the upper part of the said pipe is prevented by the ascent of smoke from below, thus creating a draft in the chimney in excess of that effected by the natural ascent of smoke from the fire below. It will be understood that the current in the inclined pipes which face the wind is further increased by the wind blowing directly into them, while that in those which are on what might properly be termed the lee side of the chimney is consequent solely upon the checking of the motion of the wind, as before described.

We claim as our inVention-- In a chimney-cowl, the main central smokepipe thereof having a downwardly-extending flared flange secured to its upper edge, and its wall provided with openings and inclined pipes leading from the said openings in an upward direction and toward the center of the smoke-pipe, and terminating at a point above the junction of the said flared flange and the smoke-pipe, combined with a hood placed over the said central smoke-pipe havin g a central exit-aperture, and a cap to cover the said aperture, substantially as specified.

EZEKIEL MILLS, JR. HENRY O. REESE. Witnesses:

W. L. TRENARY, J. ROBT. CONMARD. 

